Today, miles of empty tunnels run beneath the streets of London. The government constructed them over one hundred feet beneath the surface to serve as shelter during the air raids of WWII. However, after the war, many of these tunnels were left abandoned. Funding to convert them into tube lines ran dry.

Over time, the spaces took on various identities – from the storage of government documents to temporary accommodations for Caribbean immigrants. One of the more recent applications, though, is breathing new life into a space once associated with a dark history.

Growing Underground grows fresh micro greens and salad leaves in one of these quiet tunnels beneath the bustling streets of Clapham, South London. A combination of hydroponics and LED technology, the closed-loop farm grows crops year-round in a controlled environment with no pesticides. Due to hyper-local production, the team boasts that the produce can be in your kitchen within four hours of being picked and packed.

Unreasonable visited the underground farm and spoke with Steven Dring, co-founder of Growing Underground, about discovering the potential of urban farming and unleashing a degree of belligerence to make it succeed.